The troubled mum-of-five had last week publicly praised daughter Bunny as her "gorgeous little bundle of perfectness" as she turned four.
But yesterday Katie failed to mention her son's special day after narrowly managing to avoid bankruptcy last week.
She has agreed to come up with a plan to pay off her debts amid a divorce battle with third husband Kieran.
Yesterday he threw a birthday party for their five-year-old son who he hailed as his "best friend".
The 31-year-old showed off cakes his mum Wendy had baked for his party.
Writing next to the picture of Jett on Instagram, Kieran wrote: “Happy 5th birthday to not only my best friend but my gorgeous little boy!!
“Love you Jett with all my heart.”
Katie, 40, and Kieran also have a daughter, four-year-old Bunny, together.
Last week the former couple’s explosive break up was shown on TV during an episode of Katie’s Quest Red reality show.
Since they split, Kieran has moved on with Michelle Penticost – a mum he met at Jett’s primary school.
The Sun Online recently revealed how Kieran had moved in with his grandmother following the breakdown of their marriage.
A source explained: “Kieran’s skint – he didn’t work for years because he was at home looking after the kids and Katie’s farm, so he’s got no savings.
“He’s talking about selling his wedding ring that Katie bought for their 2013 wedding.“It’s worth around £1,000 and has two bands of diamonds around it, but he thinks he can get around £500 for it.
“It’s worthless to him now and holds nothing but bad memories so he’s keen to get rid of it.
“It would help him bring in some cash, as right now he’s a bit short.
“He thinks he’s unemployable due to everything Katie’s said about him, so he’s living with his nan in Sussex.
“He can’t go back to stripping – he doesn’t think it’s right now he’s a dad – and it’s not like he can get a job stacking shelves in the local supermarket.”
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